The added peripheral vision is a major plus, especially when you're just starting out.
Not to metion being able to see into the corners better, which I now know is of PARAMOUNT imortance...
I am going to be co-driving my buddies 1991 Red Devil sometimes though, so I am going to want to stick with the closed-face design.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...